Improvement in hoisting-jack



the letters of reference marked thereon.

@eine grains altrui @fitta s. y B.. RITTENHOUSE, or PLYMOUTH, IND-IANA.

Letters .Patent No. 72,329, dated .December 17, 1867.

vIMPROYLIVINT IN HOISTING-JACK.

ilge tinhnl .maat tu in tipa trtta rtent mit making puit if tigt una TO ALL WHOM IT lMAY GONCERN:

Be 1t known that I, S. B. RITTEHOUSE, of' Plymouth, in the county of Marshall, and State of Indiana, have invented a new and useful Improvement in Hoisting-Jacks; and I do hereby declare Athat the following is a full, clear, and exact description of the same.

The object of this invention is to provide a small and portable machine, through which a very great power may be obtained, for the purpose of hoisting heavy weights, or. propelling heavy bodies, or exerting a great force in any direction, as propelling a ditching-machine or a plough for laying drain-tile; and the invention consists in operating upon a bar, (which shall have a rack -or cogs upon its side,) by a lever or crank, through cog-wheels and pinions; and i To enable those skilled in the art to make and use my invention, I will proceed to describe its construction and` operation, reference being had to the accompanying drawing, forming a part of this specification, and to Figure 1 represents a view of the jack complete.

Figure2 is aA longitudinal section throughthe line :v x of iig. 1. i A is the box which enoleses the hoisting-bar, and which supports the shafts, to which the wheels and pinions `-are attached.

B is the hoisting-bar. This har is square, or nearly so, and one side'forms a rack, with cogs, extending from near its outer or upper end as far down on the bar as it is designed to have it lmove whenoperating with it.

The lower end is turned out at B', and forms astop against the box A, which is open on that side. The stop' prevents the bar from moving too far out of lthe box, and is used for hoisting or drawing, when it is more convenient to apply the power of the jack from this point than from theA other end of .the bar.

C is a shaft, to which the power which operates the machine is applied.' It has journals and bearings on the box A. vIt is formed so that levers or cranks may be attached to both ends. There are two pinions, a a,

on this shaft, the pinions being fornied iii the shaft. The shaft stands at right angles with lthe hoisting-bar B.

D is another shaft, having bearings on it', and is supportedby the bdx A. Itvhastwo spur-wheels, b one on each end, which work in the pinionson the shaft 0. These wheels are placed on the shaft so that they work on the outside of the box, with collars, which prevent the shaftfrom having play endwise. The pinions or oogs. on the shaft O are placed to `fit the position of these wheels. On the middle of this shaft, D, inside thebox, is the pinion, which works in the ruck or cogs on the hoisting-bar B. i

f is a pawl, which serves to hold the vvrvhoisting-.bar up or to itsplace. end of thepawl works againstA the cogs ofthe rack onv thebar. It is kept inposition by a spring, g. Both the spring and the pawl are attached to and work inside the box. y v

` H is the lever or crank, attached to the shaft C.- Upon the bottom end thereis a broad' plate, c, for the purpose of giving thejaclca better bearing, and also to secure and hold together the-side of the box. 'l

It maybe well to say here that the box A is mainly composed of two at plates, which support the shafts',

and between which the hoisting-bar works'. These plates are mudewider where Athe gearingwheelsare placed, in order that the wheels may be placed in a proper position. 'I

, `Therc is a strong bar, m, placed back of the wheels, and back of the hoisting-bar, and against which the hoisting-bar bears. The sides of the box are firmly riveted to the bar. I

The stop or dog B' allows .the hoisting-bar to rise no higher than the bottom end of the bar m.

Having thus described my invention, whatl I claim as new, and desire to secure by Letters Patent, is-

1. The spring g, secured between' the sides of theibox A, and forming its front side, arranged in relation therewith, and with the pawlf, as herein shown and described. l

2. The construction and arrangement of the box A, spring'g, pawlf, projection B', upon vhoisting-lunwheels b, cog-shaft C, shaft D, and pinion E, as herein set forth for the purpose spcciled. 4 l

s. B. RITTENHOUSE.

Witnesses: C. H. Rn'nvn,

ALEXANDER BLAND. 

